GALA INDUSTRIAL.. Instructions Manual.
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3.3. RECOMMENDATIONS FOR THE USE OF THE EQUIPMENT AND WELDING OPERATION.
MATERIALS AND GASES.
The adjustment of the welding parameters in the MIG-MAG equipment is a much more sensitive job than in
traditional welding equipment. The adjustment depends mainly on:
- Welding voltage.
- Wire speed.
- Type of gas used.
- Thickness and material of the part to be welded.
- Arc length, torch position and type of seam.
The welding intensity depends on the wire speed. If the wire speed increases, the welding current value will
increase resulting in a shorter arc.
If maximum penetration is desired, the minimum voltage possible must be used. Although it must be taken
into account that as the voltage drops the seam aspect worsens.
The correct adjustment of the welding parameters results in a smooth and quiet operation, with a typical
sound during operation.
If the wire speed is high, the wire tends to trip up and the arc becomes unstable. If the speed is low there
may be many projections or the wire can get burnt.
If the reactance value chosen is low (respect to that needed) the number of projections is high; if the
reactance is very high the wire tends to get wound up. The greater the wire diameter, we must consider a high
reactance.
The direction of the torch movement and the position of the torch affect the quality of the welded seam.
SOFT AND WEAKLY ALLOYED STEELS WELDING.
We recommend using a gas mixture of Argon plus CO
2
. Remember there are special mixtures, which will
optimise the welding process.
Pure CO
2
can be used, although we do not recommend this as, although it provides greater welding
penetration, the aspect of the welded seam is worse, and also the number of projections is higher, the correct
choice of the reactance tap acquiring great importance in this case. The best gas flows are between 8 and 12
litres, depending on the wire diameter.
The wire to be used in this case will be steeled with a copper surface treatment. It protects the wire from
humidity.
STAINLESS STEELS WELDING.
In this case the most suitable gas is pure Argon. If this gas does not offer suitable results in the job to be
done, we advise using a mixture of Argon and 2% oxygen.
The best gas flows are between 8 and 12 l/min. The wire coil will be of stainless steel with suitable
composition depending on the material to be welded.
ALUMINIUM WELDING.
The gas to be used in this case is pure Argon (MIG welding system). The flows will be between 8 and 18
l/min.
We advise using an aluminium wire with a minimum diameter of 1 mm. Aluminium is a soft material,
which can cause problems in driving. Do not press the motor handle too much. The torch cable must be of
Teflon. Torch neck: Strap cable. If you wish to weld with aluminium and have doubts, contact us.
